Enthusiasm.

1603, from M.Fr. enthousiasme, from Gk. enthousiasmos, from enthousiazein “be inspired,” from entheos “inspired, possessed by a god,” from en- “in” + theos “god”. Acquired a derogatory sense of “excessive religious emotion” (1660) under the Puritans; generalized sense of “fervor, zeal” (the main modern sense) is first recorded 1716.